Current transformer - three-phase, rated voltage 720V AC, 250/5A TP-250-5

Three-phase current transformer – precise measurement and installation protection

This current transformer is a key element in measurement systems and electrical protection. Designed for use with three-phase circuits, it enables safe and accurate current monitoring. Its closed-core design ensures reliable operation, and accuracy class 1 guarantees precise measurements. This is a solid solution for both professional installers and end-users who value safety and energy efficiency.

Construction and application

The current transformer with a ratio of 250/5A is designed for mounting on a DIN rail, panel or directly on the wire. Its compact dimensions (76.5 mm x 74 mm x 80 mm) allow for installation even in limited spaces. It is designed to operate at frequencies of 50-60 Hz and at a maximum voltage of 720 V AC. This makes it suitable for a wide range of electrical installations – from industrial to commercial and residential. The transformer allows for safe current measurements without the need to directly interfere with the primary circuit, which increases work safety and minimizes the risk of damage.

Key features and benefits

• High accuracy: Accuracy class 1 ensures precise current measurements, which is important for the correct operation of energy consumption monitoring systems and protection devices.
• Safety: Provides galvanic isolation of the secondary circuit from the primary circuit, protecting service personnel and measuring devices from high voltages.
• Versatility: The possibility of mounting on a DIN rail, panel or wire facilitates integration with various types of electrical installations.
• Durability: Made of high-quality materials, guarantees long-lasting and reliable operation even in difficult environmental conditions (operating temperature -5°C to +40°C).
• Touch protection: The design with touch protection minimizes the risk of accidental electric shock during operation.
• Overload resistance: Overcurrent factor FS 5 means that the transformer can temporarily withstand currents significantly exceeding the rated value without damage. Thermal current (lth) is 60 x In and dynamic (Idyn) 2.55 x lth, which further increases its resistance to failures.
• Compliance with standards: Meets the requirements of IEC 60044-1, which confirms its quality and safety of use.

The rated primary current is 250 A, the rated secondary current is 5 A, and the rated apparent secondary power is 2.5 VA. Accuracy class is 1, and overcurrent factor FS 5. The insulation withstand voltage is 3 kV/1 min.

This transformer is a reliable tool for anyone who needs precise current measurement in electrical installations – from simple home applications to advanced industrial systems. Its solid construction and compliance with standards ensure long-lasting and safe operation.